prosody
84c7779618b6
util/id.lua

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util/id.lua @ 13252:84c7779618b6

core.portmanager: Join strings broken into multiple lines Improves readability. Reduces line count. What's not to like? The code style and luacheck rules allows longer lines, and these strings aren't long enough to need breaking into multiple lines like this.
author Kim Alvefur <zash@zash.se>
date Sat, 29 Jul 2023 02:04:24 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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9546c629289b util.id: New util for producing random identifiers of varying sizes
Kim Alvefur <zash@zash.se>
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2017 Matthew Wild
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3 -- Copyright (C) 2008-2017 Waqas Hussain
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4 -- Copyright (C) 2008-2017 Kim Alvefur
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 local s_gsub = string.gsub;
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11 local random_bytes = require "prosody.util.random".bytes;
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12 local base64_encode = require "prosody.util.encodings".base64.encode;
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13
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14 local b64url = { ["+"] = "-", ["/"] = "_", ["="] = "" };
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15 local function b64url_random(len)
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16 return (s_gsub(base64_encode(random_bytes(len)), "[+/=]", b64url));
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17 end
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18
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19 return {
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20 -- sizes divisible by 3 fit nicely into base64 without padding==
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21
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22 -- for short lived things with low risk of collisions
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23 tiny = function() return b64url_random(3); end;
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24
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25 -- close to 8 bytes, should be good enough for relatively short lived or uses
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26 -- scoped by host or users, half the size of an uuid
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27 short = function() return b64url_random(9); end;
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28
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29 -- more entropy than uuid at 2/3 the size
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30 -- should be okay for globally scoped ids or security token
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31 medium = function() return b64url_random(18); end;
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32
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33 -- as long as an uuid but MOAR entropy
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34 long = function() return b64url_random(27); end;
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35
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36 -- pick your own adventure
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37 custom = function (size)
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38 return function () return b64url_random(size); end;
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39 end;
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40 }